Burglar-alarm



UNITED STATES PATENT OFFICE.

GEORGE C. GRUBER AND THOMAS D. VOGAN, OF MARITS, OHIO.

BuReLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 407,654, dated July 23, 1889. Application filed March 29, 1889. Serial No. 305,295. (No model.)

To all whom, it may concern: y

Be it known that we, GEORGE C. GRUBER and THOMAS D. VVOGAN, citizens of the United States, residing at Marits, in the county of Morrow and State of Ohio, haveinvented a certain new and useful Improvement in. Burglar-Alarms, of which the following is a specification.

Our invention relates to the improvement of burglar-alarms, and has particularrelation to that class of alarms in which a tappcr is made to vibrate against a bell through thev movement of a lever-escapement produced by two or more gear-wheels actuated by an or-y dinary clock-spring in -the usual manner.

The objects of our device are to so connect the tapper-arm of the ordinary form of a device of this class with the knob of a door as to admit of the bell being rung by turning said door-knob; to provide means in connection therewith whereby the tapper may be allowed to vibrate when the door-knob is turned until the spring-actuated tapper-operating mechanism has run down, or to provide for the ringing` ofithe bell only while the door-knob is being turned, and to accomplish these objects in a simple and eifective manner. These objects we accomplish in the manner illustrated in the accompanying` drawings, in which Figure l is a viewof the inner face of a portion of a door and door-frame, showing our improved alarm connected therewith. Fig. 2 is a front elevation of the alarm, showing a portion of the boxing broken away and showing the tapper held away from the bell. Fig. 3 is a side elevation of the same with a portion of the boxing broken away, and showing the tapper released for ringing;` and Fig. 4 is a front view, in detail, showing the position of the tapper-arm and its spring-holdin g rod when the tapper is in position for ringing.

Similar letters referto similar parts throughout the several views.

A represents the bell-frame, and a the mechanism boxing, which is of the usual form and which has connected therewith any ordinary form of bell-tappin g operating mechanism.

B represents the bell, which is supported in the usual manner from the upper portion of the bell-frame.

c represents the tapper-arln, consisting ot' a wire connected with a shaft (l, oscillated or vibrated by the operating mechanism in the usual manner. From this shaft the tapper-arm is bent outward a short distance, thence upward, and terminating on one side ofthe bell in a tapper-head c, as shown.

f represents a spring-rod, preferably formed of a piece of spring-wire. This rod has its lower portion secured to the front face of the bell-frame within the boxing a, and, extending upwardly, has formed in its upper portion a loop g, from which it extends upwardly a short distance and terminates in a short rearward bend or hook. This hookshaped upper end is, as shown, adapted to engage with the outwardly-bent portion of the tapper-rod c, and when so engaged holds the tapper away from the bell, as shown in Fig. 2 of the drawings;

7L represents a horizontal key extending through the boxing and having its inner end pivoted in a pin-socket formed in the inner surface of the bell-frame a, on the outer side of and near the spring-rod f. Adjoining the surface of the bell-frame the key is provided with a projecting lug 71. and has on its outer end, which projects through the face of the boxing a, in which it is pivoted, a suitable handle or iinger-piecefi.

To the loopg of the spring-rod f is secured one end of a suitable cord or wire k, which passes outward therefrom through an opening in the outer side of the boxing. The remaining end of this cord is secured, as shown, to the lower endof a spring clamping-strip l, the latter consisting of a metallic strip having its upper end so bent as to be made to embrace the knob-stem of the door. This clamp has its upper end provided with a transverse hole, opposite which is formed in the body of the clamping-strip a screw-hole. The clamp having been adjusted over the stem of a door-knob, it may be irmlysecured 'thereto by means of a screw m, made to pass IOO anism contained within the boxing having been wound up in the usual manner, the hookshaped free end of the spring-rod f being made to engage with the tapper-rod, thereby holds it from the bell and prevents its movement, and the key 7i being so turned that its lug is not projecting inward against the spring-rod, it will be seen that the turning of the door-knob will cause a corresponding movement of the clamping-strip and cord k, the movement of the latter operating to draw the spring-rod f out of its engagement with the tapper-arm and allow the latter to vibrate against the bell. When the door-knob is released from the grasp of the hand, the tension of the spring-rod f will cause it to drop back into engagement with and again lock the tapper.

In case it is desired that the bell be rung continuously until its operating mechanism is run down, when the knob is turned the key h is rst so turned that its lug will press the upper portion of the spring-rod f to one side, as shown in Fig. 4 of the drawings. The

spring-rod being in this position and the doorknob being turned, it will be seen that the former, when thus drawn away from the tapper-arm, will, when the turning of the knob is discontinued, drop back again in line with its original position, as shown in Fig. 4, and in so doing will rest against the lug of the key and be prevented from contact with the tapper-arm. Thus it will be seen that the vibration of the tapper willV be allowed to continue until the operating mechanism is run down.

Having now fully described our invention, whatwe claim,and desire to secure byLetters Patent, is-

In a burglar-alarm, the combination, with ay bell-frame, spring-actuated tapper-operating mechanism, and bell connected with said frame, of the outwardly and upwardly bent tapper-arm, spring locking-rod f, its upper free end being adapted to be made to engage with said tapper, as described, key h, having lug h', door-knob-stem clamp l, and cord or wire 7c, connecting said clamp and spring-rod f, substantially as and for the purpose speciied.

GEORGE C. GRUBER. THOMAS D. VOGAN.

In presence of- I. T. MCLAIN, B. G. MASTERS. 

